Special double-cavity row type airflow crushing system for producing diamond micro-powder

Abstract

The invention provides a special double-cavity row type airflow crushing system for producing diamond micro-powder, and effectively solves the problems that when an existing airflow crushing machine crushes diamond, the impact frequency of large particles is insufficient, small particles are excessively crushed, the particle size distribution range of the crushed micro-powder is wide, and the particle size of the produced diamond micro-powder is not uniform. According to the technical scheme, the device comprises two jet mills and a connecting structure, the jet mill comprises a crushing cavity, a feeding hole, a crushing nozzle, a pressure equalizing chamber and an air outlet; the crushing cavity is of a disc cavity structure consisting of a circular-ring-shaped side lining plate, an upper-end lining plate and a lower-end lining plate; spiral strips are arranged on the inner side walls of the side lining plates; the connecting structure comprises a cylindrical shell and a hollow pipe at the lower end of the cylindrical shell, and one end of the hollow pipe gradually faces downwards and communicates with the crushing cavity; a material guide plate is arranged on the lower end surface of the upper end lining plate; blanking pipes are arranged on the left and right sides of the lower end of the cylindrical shell; the lower ends of the blanking pipes are communicated with the crushing cavity; a filter screen is arranged at the upper end of the cylindrical shell.

Description

Technical Field

[0001] The invention relates to the technical field of diamond micropowder production, in particular to a double-cavity linked airflow pulverizing system specially used for producing diamond micropowder. Background Art

[0002] Airflow pulverizer is a device that uses the energy of high-speed airflow or superheated steam to make material particles impact, collide, friction and shear each other to achieve ultra-fine grinding. It is widely used in ultra-fine grinding of chemical industry and non-metallic minerals. The equipment has a simple and ingenious structure, is safe and reliable, easy to use, and low cost. It is also one of the main equipment for producing diamond micropowder. However, considering that diamond is one of the hardest materials in nature, it has a high hardness and requires multiple frequent collisions to achieve the purpose of crushing. However, when the existing airflow pulverizer is running, the material needs to rotate one circle to produce an impact collision at the intersection, which greatly limits the production efficiency of diamond micropowder.

[0003] In order to improve the crushing efficiency of diamond micropowder, the prior art usually adds a stirring rod or a cage structure in the crushing chamber to increase the frequency of collision of diamond particles. For example, a crushing device for fine material shaping of diamond micropowder disclosed in patent document CN214554220U is used. However, the result is contrary to expectations. Although the diamond particles increase the collision frequency, the stirring rod or cage also affects the running speed and direction of the airflow in the crushing chamber. Moreover, the larger particles of materials are often concentrated at the outermost edge of the crushing chamber, which also greatly reduces the probability of collision between large particles of diamond and the stirring rod. However, the smaller diamond particles repeatedly collide and crush with the stirring rod, which results in a wider distribution range of diamond particle size and poor quality of the produced diamond micropowder. Also in order to increase the collision frequency, patent document CN208194527U discloses a diamond particle crushing device, in which hammers and inserts are added, but their function is to lift large particles upward in order to achieve full collision. However, it cannot be ignored that during the implementation of this scheme, large particles will also collide with small particles downward, which also leads to excessive crushing of small particles and insufficient crushing of large particles. The particle size distribution range is wide, and the particle size is also uneven. Moreover, the device cannot operate continuously, but can only work intermittently, which does not conform to the existing continuous production line. In addition, there is a fluidized bed airflow pulverizer disclosed in patent document CN112473964A, which uses a method of screening diamond materials into particles of different sizes and crushing them separately at the same time, but it does not solve the problem of insufficient collision frequency of large particles at all.

[0004] In order to solve the above problems, a double-chamber parallel airflow pulverizing system for producing diamond micropowder is now provided. It is specially designed for diamonds with higher hardness. On the basis of the existing airflow pulverizer, two airflow pulverizers are connected in series. The centrifugal force of large particles in rotation is also larger, so that the two streams of large diamond particles can collide with each other, increasing the crushing efficiency of large diamond particles, making the distribution range of diamond particle size after crushing narrower, greatly improving the uniformity of diamond micropowder, and helping to improve product quality. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a double-chamber linked airflow pulverizing system specially designed for producing diamond micropowder, which effectively solves the problems of insufficient collision frequency of large particles, excessive pulverization of small particles, a wide distribution range of particle size of the micropowder after pulverization, and uneven particle size of the produced diamond micropowder when the existing airflow pulverizer is used to pulverize diamonds.

[0006] The technical solution is to include two air flow pulverizers and a connecting structure; The air flow mill comprises a grinding chamber, a feed port, a grinding nozzle, a pressure equalizing chamber, and an air outlet; the grinding chamber is a disc cavity structure composed of a circular ring-shaped side lining plate, an upper end lining plate, and a lower end lining plate; a spiral strip is fixed on the inner side wall of the side lining plate; when the grinding nozzle drives the diamond particles to rotate at a high speed in the grinding chamber, the diamond particles spirally rise under the action of the thread strip; The connecting structure is located on the upper side of the middle part of the two air flow mills, and the connecting structure includes a cylindrical shell with an opening at the upper end, a hollow tube fixed at the lower end of the cylindrical shell, and the end of the hollow tube away from the cylindrical shell gradually penetrates downward through the corresponding upper end lining and is connected with the crushing chamber; in the top projection, the direction of the hollow tube is tangent to the crushing chamber; an inclined guide plate is fixed on the lower end surface of the upper end lining, and the guide plate is located below the end of the hollow tube; when the centrifugal force of the diamond particles is large enough, the diamond particles spirally rise along the thread strip and eventually enter the hollow tube along the guide plate; there is a drop tube on both sides of the lower end of the cylindrical shell, and the lower end of the drop tube is inclined outward and is connected with the corresponding crushing chamber; a filter is installed at the upper end of the cylindrical shell.

[0007] In the above, when the crushing nozzle drives the diamond particles to rotate at high speed in the crushing chamber, the diamond particles are close to the thread strips on the side liner under the action of centrifugal force, and the diamond particles move upward along the thread strips. When the centrifugal force of the particles is large enough, the diamond particles enter the hollow tube along the guide plate, and the two large diamond particles on the left and right of the hollow tube collide violently in the cylindrical shell cavity. After the collision, they enter the crushing chamber along the two drop pipes, and the falling particles collide with the high-speed rotating particles in the crushing chamber again.

[0008] Furthermore, the hollow tube has a slowly rising structure, and the two hollow tubes form an arc-shaped tube with an opening facing downward, and the cylindrical shell is located in the middle of the arc-shaped tube.

[0009] Furthermore, a cylinder is mounted on the upper end of the cylindrical shell, a spring is installed between the lower end of the cylinder and the hollow tube, and a filter is installed in the cylinder, and the filter completely covers the opening at the upper end of the cylindrical shell.

[0010] Furthermore, the drop tube is a straight tube, and the two drop tubes form a V-shaped structure with an opening facing downward.

[0011] Furthermore, there is a gap between the lower end of the threaded strip and the lower end of the crushing chamber.

[0012] The invention has an ingenious structure. On the basis of the existing air flow pulverizer, two air flow pulverizers are connected in series. The centrifugal force of large-particle materials is also large during rotation, so that two streams of large-particle diamond materials can collide with each other, thereby increasing the crushing efficiency of large-particle diamonds, making the distribution range of the size of the crushed diamond particles narrower, greatly improving the uniformity of the diamond powder, and being beneficial to improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the present invention.

[0014] Figure 2 It is a top view of the present invention.

[0015] Figure 3 It is an overall three-dimensional schematic diagram of the present invention.

[0016] Figure 4 It is a three-dimensional exploded diagram of the present invention.

[0017] Figure 5 It is a structural diagram of the side lining plate and the spiral strip thereon in the present invention.

[0018] Figure 6 The three-dimensional structure of the upper liner in the present invention Figure 1 .

[0019] Figure 7 The three-dimensional structure of the upper liner in the present invention Figure 2 .

[0020] Figure 8 for Figure 2 Middle AA section view.

[0021] Fig. 9 for Figure 2 Middle BB section view. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0023] Depend on Figures 1 to 9 It is given that the present invention comprises two air flow mills 1 and a connecting structure 2; The air flow mill 1 comprises a grinding chamber, a feed port 3, a grinding nozzle 4, a pressure equalizing chamber 5, and an air outlet 6; the grinding chamber is a disc cavity structure composed of a circular ring-shaped side liner 7, an upper liner 8, and a lower liner 9; a spiral strip 10 is fixed on the inner wall of the side liner 7; when the grinding nozzle 4 drives the diamond particles to rotate at a high speed in the grinding chamber, the diamond particles spirally rise under the action of the thread strip; The connecting structure 2 is located on the upper side of the middle part of the two air flow mills 1, and the connecting structure 2 includes a cylindrical shell 11 with an opening at the upper end, a hollow tube 12 fixed at the lower end of the cylindrical shell 11, and the end of the hollow tube 12 away from the cylindrical shell 11 gradually penetrates downwardly through the corresponding upper end liner 8 and is connected to the crushing chamber; in the top projection, the direction of the hollow tube 12 is tangent to the crushing chamber; an inclined guide plate 13 is fixed on the lower end surface of the upper end liner 8, and the guide plate 13 is located below the end of the hollow tube 12; when the centrifugal force of the diamond particles is large enough, the diamond particles rise spirally along the thread strip and eventually enter the hollow tube 12 along the guide plate 13; there is a drop tube 14 on both sides of the lower end of the cylindrical shell 11, and the lower end of the drop tube 14 is inclined outward and is connected to the corresponding crushing chamber; a filter screen 15 is installed at the upper end of the cylindrical shell 11.

[0024] In the above, when the crushing nozzle 4 drives the diamond particles to rotate at high speed in the crushing chamber, the diamond particles are close to the thread strips on the side liner 7 under the action of centrifugal force, and the diamond particles move upward along the thread strips. When the centrifugal force of the particles is large enough, the diamond particles enter the hollow tube 12 along the guide plate 13, and the two large diamond particles on the left and right of the hollow tube 12 collide violently in the cavity of the cylindrical shell 11. After the collision, they enter the crushing chamber along the two drop pipes 14, and the falling particles collide with the high-speed rotating particles in the crushing chamber again.

[0025] In order to avoid the impact and wear of the inner wall of the hollow tube 12 by large particles, the hollow tube 12 is in a slowly rising structure. The two hollow tubes 12 form an arc tube with an opening facing downward, and the cylindrical shell 11 is located in the middle of the arc tube.

[0026] In order to prevent diamond particles from escaping from the upper end of the cylindrical shell 11 and to facilitate cleaning of the filter 15, a cylinder 16 is mounted on the upper end of the cylindrical shell 11, a spring is installed between the lower end of the cylinder 16 and the hollow tube 12, and the filter 15 is installed in the cylinder 16, and the filter 15 completely covers the upper end opening of the cylindrical shell 11.

[0027] When larger diamond particles collide in the cylindrical shell 11, in order to make the diamond particles after the collision fall into the crushing chamber as quickly as possible, the drop tube 14 is a straight tube, and the two drop tubes 14 form a V-shaped structure with the opening facing downward.

[0028] In order to prevent smaller diamond particles from entering the hollow cylinder, a gap is formed between the lower end of the threaded strip and the lower end of the crushing chamber.

[0029] It is worth noting that since the rotation direction of the gas blown out by the pulverizing nozzles 4 in the two air flow pulverizers 1 is the same, and referring to the attached Figures 1 to 4 The two large diamond particles will enter the cylindrical shell 11 at high speed along the corresponding hollow tube 12 and collide violently. The particles after the collision will fall into the crushing chamber along the drop tube 14 and collide with the particles in the crushing chamber again, increasing the frequency of particle collision, which is beneficial to improving the overall crushing efficiency.

[0030] Since the left end of the left hollow tube 12 is located in the front half of the left crushing chamber and the right end of the right hollow tube 12 is located in the rear half of the right crushing chamber, two airflows carrying a large amount of large diamond particles can enter the hollow tube 12.

[0031] The feed of the air flow mill 1 in the present invention adopts the conventional Venturi principle. Specifically, high-speed gas passes under the funnel, and then the Venturi principle is used to realize the feed. This technology is conventional technology and will not be repeated here. When in use, start two air flow mills 1, and the pulverizing nozzle 4 sprays high-speed gas to drive the diamond material in the pulverizing disk to rotate. The centrifugal force of the smaller diamond particles is smaller and concentrates to the center, and is taken out of the pulverizing chamber by the gas outlet 6, and then collected by the bag vacuum cleaner; the centrifugal force of the larger diamond particles is larger, and the large diamond particles stick to the inner wall of the side lining plate 7 and gradually rise along the spiral strip 10. When the large diamond particles have a sufficiently large centrifugal force, the large diamond particles are "thrown" into the hollow cylinder. At this time, two diamond particles with the same speed and opposite direction collide to achieve pulverization; the pulverized particles enter the pulverizing chamber again through the blanking cylinder and collide with the high-speed rotating diamond particles again.

[0032] It is not difficult to see from the above that in the present invention, when the material rotates one circle, at least three violent collisions occur. The first is when feeding, the material just entering is slow, and these materials collide with the high-speed moving diamond particles in the crushing chamber. The second is when the large diamond particles are thrown into the hollow cylinder under the action of centrifugal force and violently collide in the cylindrical shell 11 cavity; the third is when the material returns to the crushing chamber again from the drop tube 14, and the material entering the crushing chamber again collides with the original and high-speed moving diamond particles in the crushing chamber. The above three collisions are all relatively violent collisions, among which the second collision is the most violent, which is the collision between two beams of large diamond particles with opposite movement directions. The violent collision can maximize the crushing efficiency and is beneficial.

[0033] Last but not least, the width of the thread strip in the present invention should not be too wide, and the width of the spiral strip 10 is narrow at the lower end and then gradually widens upwards, so as to minimize the small diamond particles entering the hollow tube.

[0034] Compared with the traditional method, the large particles are outside the crushing chamber, and can only collide violently once per rotation, resulting in low crushing efficiency. In the present invention, the larger the particles, the greater the centrifugal force, which also enables the large particles to move upward along the spiral strip 10, presenting a spiral upward trajectory, and then violently collide in the cylindrical shell 11 cavity, while the smaller diamond particles are not affected, and finally the size distribution of the crushed particles is uniform, and the particle size distribution range is narrow, which not only increases the crushing efficiency exponentially, but also helps to improve the quality of diamond micropowder.

[0035] In the present invention, based on the existing disc airflow pulverizer in the production line, during the pulverization, the difference in centrifugal force is firstly utilized, large particles are concentrated at the edge of the pulverization chamber, and small particles are concentrated to the center of the pulverization chamber and are carried away by the airflow, so that the collision frequency between large particles is greatly improved, and at the same time, excessive pulverization of small particles is avoided, and continuous operation can be achieved, thereby improving the pulverization efficiency and quality. The particle size distribution range of the pulverized diamond particles is narrow and the particle size is uniform.

[0036] The present invention has an ingenious structure. On the basis of the existing air flow pulverizer 1, two air flow pulverizers 1 are connected in series. The centrifugal force of large-particle materials is also large during rotation, so that two streams of large-particle diamond materials can collide with each other, thereby increasing the crushing efficiency of large-particle diamonds, making the distribution range of the crushed diamond particles narrower, greatly improving the uniformity of diamond powder, and being beneficial to improving product quality.

Claims

1. A double-chamber linked airflow pulverizing system for producing diamond micropowder, characterized in that: It comprises two air flow pulverizers (1) and a connecting structure (2); The air flow mill (1) comprises a grinding chamber, a feed port (3), a grinding nozzle (4), a pressure equalizing chamber (5), and an air outlet (6); the grinding chamber is a disc cavity structure composed of a ring-shaped side liner (7) and an upper liner (8) and a lower liner (9); a spiral strip (10) is fixed on the inner wall of the side liner (7); when the grinding nozzle (4) drives the diamond particles to rotate at a high speed in the grinding chamber, the diamond particles spiral upward under the action of the spiral strip; The connecting structure (2) is located on the upper side of the middle part of the two air flow pulverizers (1), and the connecting structure (2) comprises a cylindrical shell (11) with an opening at the upper end, a hollow tube (12) fixed at the lower end of the cylindrical shell (11), and an end of the hollow tube (12) away from the cylindrical shell (11) gradually penetrates downward through the corresponding upper end liner (8) and is connected to the pulverizing chamber; in a top view projection, the direction of the hollow tube (12) is tangent to the pulverizing chamber; a hollow tube (12) is fixed on the lower end surface of the upper end liner (8) An inclined material guide plate (13) is located below the end of the hollow tube (12); when the centrifugal force of the diamond particles is large enough, the diamond particles rise spirally along the thread strips and eventually enter the hollow tube (12) along the material guide plate (13); a material drop pipe (14) is provided on both sides of the lower end of the cylindrical shell (11); the lower end of the material drop pipe (14) is inclined outwardly and communicates with the corresponding crushing chamber; a filter screen (15) is installed at the upper end of the cylindrical shell (11).

2. The double-chamber linked airflow pulverizing system for producing diamond micropowder according to claim 1 is characterized in that: The hollow tube (12) has a slowly rising structure, and the two hollow tubes (12) form an arc-shaped tube with an opening facing downward, and the cylindrical shell (11) is located in the middle of the arc-shaped tube.

3. The double-chamber linked airflow pulverizing system for producing diamond micropowder according to claim 1 is characterized in that: The upper end of the cylindrical shell (11) is sleeved with a cylinder (16), a spring is installed between the lower end of the cylinder (16) and the hollow tube (12), and the filter screen (15) is installed in the cylinder (16), and the filter screen (15) completely covers the upper end opening of the cylindrical shell (11).

4. The double-chamber linked airflow pulverizing system for producing diamond micropowder according to claim 2 is characterized in that: The drop tube (14) is a straight tube, and the two drop tubes (14) form a V-shaped structure with an opening facing downward.

5. A double-chamber linked airflow pulverizing system for producing diamond micropowder according to any one of claims 1 to 4, characterized in that: The lower end of the thread strip is spaced from the lower end of the crushing chamber.

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